Answer:

catalyst

Answer	Crossword Clue
CATALYST	Reaction facilitator
CATALYST	It'll get you a reaction?
CATALYST	Chemist's facilitator

CATALYST	Agent of change
CATALYST	Spark
CATALYST	Precipitating agent
CATALYST	Chemist's reaction-producer
CATALYST	That which causes
CATALYST	Agent for action
CATALYST	Spark plug of a sort
CATALYST	Stimulus of a kind

CATALYST	Part of a chemical reaction
CATALYST	Instigator
CATALYST	Prompter
CATALYST	It makes things happen
CATALYST	What sets things in motion
CATALYST	Chemical reaction helper
CATALYST	Change agent

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.